Question

Suppose I have a folder called test.
Now I pass that folder into a program and it will output a file called test.xyz in the same directory that contains the target folder.

The general logic I’m using is something like

string outDir = Path.GetDirectoryName(path);
string outName = Path.GetFileName(path).TrimEnd("\\".ToCharArray()) + ".xyz";
string outFile = Path.Combine(outDir, outName);

Which works, but it seems kind of excessive to perform so many operations just to build my new filename.

1: Can I reduce the number of Path calls to achieve my result?
2: Can I do something about the second line to avoid trimming and also avoid using that add operation?

Answer 1

You could use a FileInfo for that!

string path = @"C:\Windows\System32\";
FileInfo fi = new FileInfo(path);
string outFile = fi.DirectoryName + ".xyz";

works like a charm. even with trailing slash in the directory string